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. Author manuscript; available in PMC: 2018 Dec 1.
Published in final edited form as: JAMA Pediatr. 2017 Dec 1;171(12):1192–1199. doi: 10.1001/jamapediatrics.2017.3209

Figure 1.

Figure 1

Flow of Adolescent e-Cigarette Users in Study

Note. Figure depicts flow of adolescents in study to assess e-cigarette nicotine concentration vaped at baseline and subsequent use of combustible cigarettes and e-cigarettes. Baseline assessment = Spring 2015, 10th grade.